[gtk+] gtk3-demo: Make blendmodes example non-resizable

[Matthias Clasen <matthiasc src gnome org>]

commit 507e58df4e0c6a4dea6ae7a4e209681db7bf511f
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jul 3 18:29:21 2016 -0400

    gtk3-demo: Make blendmodes example non-resizable
    
    It doesn't need to.

 demos/gtk-demo/blendmodes.ui |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/demos/gtk-demo/blendmodes.ui b/demos/gtk-demo/blendmodes.ui
index 9badf33..02dc736 100644
--- a/demos/gtk-demo/blendmodes.ui
+++ b/demos/gtk-demo/blendmodes.ui
@@ -3,6 +3,7 @@
   <requires lib="gtk+" version="3.20"/>
   <object class="GtkWindow" id="window">
     <property name="can_focus">False</property>
+    <property name="resizable">False</property>
     <property name="title">CSS Blend Modes</property>
     <property name="default_width">400</property>
     <property name="default_height">300</property>